Iglesias
- Sardinian name: Bidd'e Crèsia
- Population: 24.521
- Elevation: 200 m a.s.l.
- Demonym: Iglesienti/Igresientis
- Neighbouring municipalities: Buggerru, Carbonia, Domusnovas, Fluminimaggiore, Gonnesa, Musei, Narcao, Siliqua, Vallermosa, Villacidro, Villamassargia
